forked from Mirrors/freeswitch
V.27ter modem modified to make it a little less tolerant of poor SNR, and a
little more tolerant of big timing errors between the symbols at the far end, and as they are received by us.
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@ -497,14 +497,14 @@ static __inline__ void symbol_sync(v27ter_rx_state_t *s)
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s->gardner_integrate += (p + q > 0) ? s->gardner_step : -s->gardner_step;
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if (abs(s->gardner_integrate) >= 256)
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if (abs(s->gardner_integrate) >= 128)
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{
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/* This integrate and dump approach avoids rapid changes of the equalizer put step.
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Rapid changes, without hysteresis, are bad. They degrade the equalizer performance
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when the true symbol boundary is close to a sample boundary. */
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//span_log(&s->logging, SPAN_LOG_FLOW, "Hop %d\n", s->gardner_integrate);
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s->eq_put_step += (s->gardner_integrate/256);
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s->total_baud_timing_correction += (s->gardner_integrate/256);
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s->eq_put_step += (s->gardner_integrate/128);
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s->total_baud_timing_correction += (s->gardner_integrate/128);
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if (s->qam_report)
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s->qam_report(s->qam_user_data, NULL, NULL, s->gardner_integrate);
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s->gardner_integrate = 0;
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